1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index a367ed5bb3fe..0fa491326c4a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -650,6 +650,7 @@ typedef struct pglist_data {
 
 #include <linux/memory_hotplug.h>
 
+extern struct mutex zonelists_mutex;
 void get_zone_counts(unsigned long *active, unsigned long *inactive,
                         unsigned long *free);
 void build_all_zonelists(void *data);